Setting value of variable

[Jack10270]

Hi this request for adding variable support to plugin

When user types expression sender can set value of variable:

(Sender) /calc x + 1
(Server) Enter value for variable x:
(Sender) 3
(Server) x + 1 = 4 where x = 3

(Sender) /calc x + 1
(Server) Enter value for variable x:
(Sender) pi / 4
(Server) x + 1 = 1.7 where x = 0.7

For this cyou can use await-std to be done easy (code adapted from https://github.com/SOF3/await-std-examples/blob/master/BanHammer/src/SOFe/BanHammer/Main.php)

$expr = implode(" ", $args);
Await::f2c(function() use($sender, $expr) : Generator{
	try{
		$values = [];
		foreach(expr variables as variable){
			$sender->sendMessage("Enter value for variable "  + $variable);
			$value = $std->consumeNextChat($sender);
			$values[variable] = $value;
		}

		evaluate expression using $values
	}catch(QuitException){
		// do nothing if $sender quit
	}
});

[NhanAZ]

This issue is related to the math expression parsing library I am using on this plugin
I think you should open an issue at https://github.com/Muqsit/arithmexp
Their library doesn't seem to support solving equations yet

[Jack10270]

Hi sir,,in the repository arithm exp in readme there is this code I think for allow to add variables

$expression = $parser->parse("x + y");
var_dump($expression->evaluate(["x" => 2, "y" => 3])); // int(5)
var_dump($expression->evaluate(["x" => 1.5, "y" => 1.5])); // float(3)

[NhanAZ]

It doesn't work as you think.
I opened an issue on his library
You can see here: Muqsit/arithmexp#12

[Jack10270]

@NhanAZ I mean equation substitution, equation solver will different thing yes

If I will give equation a + b and also give value for a and b, this is variable substitution
To do this the plugin will replace a with 3 and b with 4 and do calculation

If I will give equation a + bx and ask to find value of x, this is equation solving (solve for x)
To do this the plugin will do like "Let y = a + bx" or if its quadratic a(x^2)+bx+c the plugin will do like "Let a(x^2)+bx+c=0"

But it will also be good to have equation solver but my intend here was variable substitution

[NhanAZ]

(Sender) /calc x + 1
(Server) Enter value for variable x:
(Sender) 3
(Server) x + 1 = 4 where x = 3

Why don't you use something like this?

(Sender) /calc 3 + 1
(Server) Result: 4

[NhanAZ]

(Sender) /calc x + 1
(Server) Enter value for variable x:
(Sender) 3
(Server) x + 1 = 4 where x = 3

Why don't you use something like this?

(Sender) /calc 3 + 1
(Server) Result: 4

After about 2 years I realized my question was stupid :D